Infrared Spectrum and Structure of Germyl Cyanide

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Abstract
The infrared spectra of GeH3CN and GeD3CN have been investigated in the 260–4000‐cm−1 region with prism and grating spectrophotometers. The expected C3v symmetry has been confirmed, and seven of the eight fundamental vibrational modes of each molecule have been assigned to observed bands of appropriate shape. The frequencies of the remaining skeletal bending fundamentals have been assumed to be one‐half the frequency of their observed overtones. The rotational structures of two of the perpendicular bands of GeH3CN have been resolved and Coriolis coefficients have been determined. The spectrum in the region of the CN stretching fundamental indicates that the molecule is the normal cyanide. No evidence was obtained for the presence of the isocyanide. This observation is compared with those obtained for the alkyl germyl cyano and silyl cyano compounds which have been interpreted as equilibrium mixtures of the normal and the isocyanides.

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